![]()
I love the field coil DaVa cartridges - again they have a musicality that I find seductive. Would that have been the same with a similarly designed alnico magnet? I heard the Azzolina Gran Sfera and particularly enjoyed a magical mid range courtesy of field coil Lowther. Prior to G.I.P., there were other Japanese manufacturers making WE clones. But, I’ve been told they tried, but could not reproduce the permanent magnets in such drivers. Cogent field coil horn speakers drivers#It just put me into a different audio world. Laboratories in Japan makes clones of their field coil woofers, full range drivers, midrange drivers and tweeters and they are very good. How about sound? Well let me say this - whilst not the holy grail for everyone, the WE field coil 555 + large horn left an indelible mark on my audio soul that I can’t deny. What about the field itself? I heard something about the voicecoil interaction with the magnetic coil requiring a significantly stiff supply? But can this lead to audio related changes or distortion? Like for like, will a similarly spec’d field coil sound different to a fixed magnet? Perhaps too much scope to never land on preferred settings - plays into the audiophile illness. Need for yet another power supply to generate the flux. Okay all very interesting maybe, but what about the negatives? Well as far as I see it, the main issues are very large motor structures with considerable mass. ![]() Ferrite performs much worse in this aspect. Samarium Cobalt and Alnico are much better at retaining their flux under heat. > Fixed magnets lose their field as the voicecoil heats up with extended use. Clearly this doesn’t apply to an electromagnetic as long as it isn’t broken. Obviously I take that risk and buy vintage drivers. Cogent field coil horn speakers driver#Buying vintage alnico drivers is a little bit of a lottery in this regard since the t/s parameters of the driver could be very different depending on how old they are. > Fixed magnets lose their field over time. For instance, you can adjust the QTS of the driver to get more / less bass or you can adjust the sensitivity to match say your chosen bass solution. As a consequence, you have a very flexible speaker since you can quite dramatically adjust the sound. > The t/s parameters of the driver change quite substantially according the voltage and/or current you apply to the coil. In terms of the purported merits of field coil as deployed for drivers, the following list of advantages seemed to make some sense: I think it is fair to say that there is a certain sense of the exotic associated with the deployment of such technology but does it have any merit in terms of sound? I tried to read the web and learn from a couple of engineers but didn’t really learn a huge amount and struggled to extract the wheat from the chaff. > Turntable bearings such as those reported in the new Wilson Benesch flagship > Cartridges as used in AN / Kondo IO and DaVa > Tonearms such as the bearing in the Primary control totl arm > Field coil compression drivers such as Cogent being used by OMA in their upper models or GIP WE rebuilds > Field coil modern cone drivers such as Supravox or Atellier Rullit, Gamut Magnetics Lab, Focal Grande Woofer and Utopia sub Cogent field coil horn speakers free#Where to begin? Well we see electromagnetic tech being deployed in multifarious hifi devices (I am not sure if I missed anything but feel free to add): Cogent field coil horn speakers plus#New custom internal wiring from Analysis Plus and a newly designed wiring harness are further improvements, along with a new circular rear compression chamber for the lower mid bass horn driver.Per my other speaker build thread, please find new thread to discuss all things field coil. Only the light colored sap wood was used from each tree, which greatly increased the amount of labor involved in fabrication.Ĭombined with the black wrinkle finish frames and black slate water jet cut grills for the twin bass modules, this new version of the Imperia offers maximum contrast in materials. Finished in hand rubbed oil and wax, we preserve the wood's natural beauty and light color. The newest iteration shown features natural Pennsylvania ash. The outboard crossover network is coupled to the Imperia via a solid slate patchboard. The high frequency horn is cast by OMA from aluminum alloy. ![]() The 300hz midrange horn uses the incomparable Cogent DS1428 field coil compression driver. The 100hz and 300hz wooden conical horns are made from a choice of solid Pennsylvania walnut, cherry, ash, or chestnut. The system as a whole is extremely efficient at approximately 105db 1w/1m, and is entirely time aligned. This special sub is 104db 1w/1m and is powered by its own solid state amplifier, designed and built by OMA. The Imperia is the ultimate speaker from OMA.Ī four way fully horn loaded system, with a vertical array of conical horns covering 100hz to 20khz, and two rear loaded subwoofer horns using a massive 21" neodymium woofer handling 20hz-100hz. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |